Locking Ring in a Pump of a Beverage System

ABSTRACT

A beverage system includes a pump that draws a set amount of a flavored concentrate into a mixing chamber for mixing with water to form a beverage. A locking ring attaches an adapter plate to a pump head. When the locking ring is in a locked position, a magnet of the locking ring is detected by a reed switch. If the locking ring rotates from the locked position, the reed switch does not detect the magnet, indicating that the locking ring, and therefore the pump head, is incorrectly or not completely installed. The controller then stops operation of the pump.

BACKGROUND OF THE INVENTION

The present invention relates generally to a pump employed in a beverage system including a locking ring having a magnet that is detected by a sensor when the locking ring is in a locked position, and the sensor provides a signal to stop operation of the pump when the locking ring moves from the locked position.

Beverages systems are employed to make beverages. A flavored concentrate and water are mixed to form the beverage. Typically, the flavored concentrate is stored in a concentrate container. A piston of a pump nutates within a pump head to draw a set amount of the flavored concentrate into a mixing chamber. Water is mixed with the flavored concentrate in the mixing chamber to form the beverage with a desired concentration.

The beverage system includes a locking ring that secures an adapter plate to the pump head. The adapter plates aligns the piston and a housing of a motor. Movement or loosening of the locking ring during use can cause the beverage system to leak.

Prior locking rings are secured to the adapter plate by screws. A tool is needed to both secure and remove the locking ring from the adapter plate. A drawback to employing screws is that the use of the tool requires additional labor.

Hence, there is a need in the art for a pump employed in a beverage system including a locking ring having a magnet that is detected by a sensor when the locking ring is in a locked position, and the sensor provides a signal to stop operation of the pump when the locking ring moves from the locked position to eliminate the need of screws and that overcomes the drawbacks and shortcomings of the prior art.

SUMMARY OF THE INVENTION

A beverage system makes beverages, soft drinks, milkshakes, dairy products, other frozen desserts or any mixed product. A pump draws a set amount of a flavored concentrate into a mixing chamber. The flavored concentrate and water combine in the mixing chamber to form the beverage.

A piston of a pump nutates within a pump head to draw the set amount of the flavored concentrate into the mixing chamber. The pump includes an adapter plate that aligns the piston and a housing of a motor. A locking ring attaches the adapter plate to the pump head.

The locking ring includes a first side with two first inward tabs and an opposing second side with two second inward tabs. A gap is defined between the inward tabs. Fingers extend outwardly from the locking ring to assist an operator in moving the locking ring.

When the pump is assembled, a circumferential flange of the pump head and a circumferential flange of the adapter plate are received in the gap of the locking ring. The circumferential flange of the adapter plate includes two opposing ramps each having a lower part, an inclined part and an upper part. The locking ring is rotated relative to the pump head in a first direction until each of the first inward tabs of the locking ring engage one of the upper parts of the ramps of the adapter plate, securing the locking ring in a locked position.

The locking ring includes a projection with a magnet pocket that receives a magnet. When the locking ring is in the locked position, the magnet is detected by a reed switch. The reed switch communicates with a controller and provides a signal that the locking ring is in the locked position. The controller continues normal operation of the pump. If the locking ring rotates from the locked position, the reed switch does not detect the magnet, indicating that the locking ring is not in the locked position and the pump head is incorrectly or not completely installed. The reed switch provides a signal to the controller that the locking ring is not in the locked position, and the controller stops operation of the pump until the locking ring is returned to the locked position.

These and other features of the present invention will be best understood from the following specification and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The various features and advantages of the invention will become apparent to those skilled in the art from the following detailed description of the currently preferred embodiment. The drawings that accompany the detailed description can be briefly described as follows:

FIG. 1 schematically illustrates a beverage system used to make a beverage;

FIG. 2 schematically illustrates a cross-sectional view of a pump of the beverage system;

FIG. 3 schematically illustrates a perspective view of a mixing chamber of the pump;

FIG. 4 schematically illustrates a front view of a housing and a pump head of the pump;

FIG. 5 schematically illustrates a perspective view of the pump head;

FIG. 6 schematically illustrates a side view of an adapter plate of the pump;

FIG. 7 schematically illustrates a perspective view of the adapter plate;

FIG. 8 schematically illustrates a perspective view of a locking ring of the pump;

FIG. 9 schematically illustrates a top view of the pump; and

FIG. 10 schematically illustrates a side view of the pump.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 1 schematically illustrates a beverage system 20 of the present invention. The beverage system 20 can be used to make beverages, soft drinks, milkshakes, dairy products, juices, other frozen desserts or any mixed product. The beverage system 20 includes a concentrate container 22 that contains a flavored concentrate 24 or syrup. In one example, the concentrate container 22 is a sealed bag that is cooled by a refrigeration system (not shown).

A pump 26 draws a set amount of the flavored concentrate 24 from the concentrate container 22 and into a mixing chamber 28. The flavored concentrate 24 from the concentrate container 22 flows along a conduit 30 and into a concentrate inlet 32 of the pump 26. The pump 26 controls the flow and the amount of the flavored concentrate 24 that is dispensed by the pump 26 through a concentrate outlet 34 and into the mixing chamber 28. Chilled water from a water source 36 cooled by a refrigeration system (not shown) flows along a conduit 38 and enters the pump 26 through a water port 40. In one example, the conduit 38 is made of copper. The pump 26 controls the flow of water through a water outlet 42 and into the mixing chamber 28. All the conduits 30 and 38 to the inlets 32 and 40, respectively, of the mixing chamber 28 are insulated.

The flavored concentrate 24 and the water are thoroughly mixed in the mixing chamber 28 to create the beverage having a desired concentration. The mixing chamber 28 is insulated to keep the mixed beverage cold. In one example, the concentration of water to flavored concentrate 24 is approximately 10:1 through 2:1. The beverage is then dispensed from the mixing chamber 28 into a cup 44 for serving.

FIG. 2 schematically illustrates the pump 26 including a pump head 46. The flavored concentrate 24 in the concentrate container 22 flows along the conduit 30 and enters the pump head 46 through the concentrate inlet 32. A portion of a piston 48 received in a compartment 50 of the pump head 46 is substantially cylindrical in shape and includes an irregular surface 58. In one example, the irregular surface 58 can be a flattened surface or a substantially u-shaped depression. A cavity is defined between the irregular surface 58 of the piston 48 and the walls of the compartment 50. The compartment 50 has a fixed volume and does not expand or contract during operation of the pump 26. In one example, the piston 48 is made of stainless steel, and the compartment 50 is made of steel. The piston 48 controls the flow of the flavored concentrate 24 from the concentrate container 22 and into the mixing chamber 28 (shown in FIG. 3) that is housed in a mixing chamber housing 29. The pump 26 is described in U.S. patent application Ser. No. 10/955,175 filed Sep. 30, 2004 and entitled POSITIVE DISPLACEMENT PUMP, herein incorporated entirely by reference.

The pump 26 includes a motor 52 that drives a motor shaft 54. The motor 52 moves the piston 48 to draw the flavored concentrate 24 into the cavity through the concentrate inlet 32 and to release the flavored concentrate 24 from the cavity through the concentrate outlet 34. The concentrate outlet 34 functions as a top portion of the mixing chamber 28. The motor shaft 54 includes a hub assembly 56. The hub assembly 56 is a plastic molded part that holds brass components that allow for free rotation within the degrees of the pump 26 operation. As the motor shaft 54 rotates, the hub assembly 56 also rotates. Engagement of the hub assembly 56 with the piston 48 causes the piston 48 to both move linearly and to rotate. That is, the piston 48 nutates.

As shown in FIG. 4, a housing 62 aligns the motor 52 and the pump shaft 54 and mounts the motor 52 to an assembly panel 98. The housing 62 includes the water port 40 that provides a path for the water from the water source 36 to flow into a water chamber 112 in the housing 62, through a water port 116 of the pump head 46, along a water flow path 70 in the water port 116 and into the mixing chamber 28. The flow of water along the water flow path 70 is controlled by a valve 130. A portion of the water port 116 of the pump head 46 is received in the water chamber 112 of the housing 62. The housing 62 includes a piston opening 124 that receives a portion of the piston 48. The housing 62 also includes a plurality of protrusion or recesses 132 that surround the piston opening 124.

FIG. 5 illustrates the pump head 46. The pump head 46 includes a circumferential flange 94 that extends around the circumference of the pump head 46. The pump head 46 also includes a piston opening 114 that receives a portion of the piston 48 and the water port 116 that detects a portion of the water flow path 70.

A piston seal 60 provides a seal between the piston 48 and the pump head 46 and provides a wiping action as the piston 48 moves in the pump head 46. The piston seal 60 is made from an elastomeric material and overmolded onto a steel backing ring. A backing seal 66 provides a barrier between a wetted portion of the pump head 46 and the water port 40 of the housing 62 to prevent accidental spillage or splashing of the flavored concentrate 24 or a cleaning solution from entering the hub assembly 56.

As shown in FIGS. 6 and 7, the pump 26 further includes an adapter plate 64 that maintains a geometric relationship between the piston 48 and the piston opening 124 of the housing 62 and minimizes movement of the piston 48. The adapter plate 64 includes a piston opening 67 that receives a portion of the piston 48 and a water opening 68 that receives the water port 116 of the pump head 46. The adapter plate 64 includes a circumferential flange 100 including two opposing ramped portions each having a lower part 108, an inclined part 109 and a raised upper part 106. When the adapter plate 64 is installed in the pump 26, the piston opening 67 of the adapter plate 64 and the piston opening 114 of the pump head 46 align, and the water port 116 of the pump head 46 is received in the water opening 68 of the adapter plate 64. The adapter plate 64 also includes a corresponding another of a protrusion or recess 134 that surrounds the piston opening 67. When the adapter plate 64 is assembled in the pump 26, the protrusions or recesses 132 align with the another of the protrusion or a recess 134 to align the adapter plate 64 and the housing 62.

As shown in FIG. 8, a locking ring 72 attaches the adapter plate 64 to the pump head 46, creating a geometric lock between the pump head 46 and the adapter plate 64. The locking ring 72 secures the pump head 46 to the adapter plate 64 to prevent leakage of the flavored concentrate 24 and the water from the pump head 46 and prevent inaccuracy. The locking ring 72 is substantially circular in shape and is made of plastic. The locking ring 72 includes a first side 74 with a plurality of first inward tabs 76 and an opposing second side 78 with a plurality of second inward tabs 80. In one example, the first side 74 includes two first inward tabs 76, and the second side 78 includes two second inward tabs 80. A gap 92 is defined between the inward tabs 76 and 80. Outward fingers 82 extend from the locking ring 72 to provide a surface for the operator to grab when rotating the locking ring 72.

The locking ring 72 and the pump head 46 are provided as a subassembly. The locking ring 72 is forced onto the pump head 46 such that the circumferential flange 94 of the pump head 46 is received in the gap 92 of the locking ring 72. The locking ring 72 freely rotates relative to the pump head 46.

When the components are installed, the circumferential flange 100 of the adapter plate 64 is positioned to be received in the gap 92 of the locking ring 72. That is, both the circumferential flange 100 of the adapter plate 64 and the circumferential flange 94 of the pump head 46 are received in the gap 92. The first inward tabs 76 of the locking ring 72 engage the adapter plate 64, and the second inward tabs 80 of the locking ring 72 engage the pump head 46. The locking ring 72 is rotated relative to the pump head 46 in a first direction until each of the first inward tabs 76 engage one of the raised upper parts 106 of the adapter plate 64 to wedge the locking ring 72 in the locked position and to attach the adapter plate 64 to the pump head 46, as shown in FIG. 9. The engagement of the locking ring 72 and the raised upper part 106 of the adapter plate 64 prevents the locking ring 72 from further rotation, and the locking ring 72 is then stopped in a locked position.

The locking ring 72 is rotated relative to the pump head 46 in an opposing second direction to loosen the locking ring 72 and remove the adapter plate 64 from the pump head 46. The first inward tabs 76 move away from the raised upper part 106 and towards the lower part 108.

The locking ring 72 includes an outward projection 93 having a pocket 84 that receives a sensing portion 86. As shown in FIG. 10, when the locking ring 72 is in the locked position, the sensing portion 86 is detected by a sensor 88. In one example, the sensing portion 86 is an integrated magnet, and the sensor 88 is a reed switch. However, the sensing portion 86 can be a ferrous object, and the sensor 88 can be a capacitive sensor. Any type of sensing portion 86 and sensor 88 can be employed. The sensor 88 is integrally clipped on the housing 62.

The sensor 88 communicates with a controller 90 that controls operation of the pump 26. When the locking ring 72 is in the locked position, the sensor 88 detects the sensing portion 86 and provides a signal to the controller 90 that the locking ring 72 is in the locked position to continue normal operation of the pump 26. If the locking ring 72 rotates from the locked position, the sensor 88 does not detect the sensing portion 86, indicating that the locking ring 72, and therefore the pump head 46, is incorrectly or not completely installed. The sensor 88 sends a signal to the controller 90 to stop operation of the pump 26.

Although a controller 90 is illustrated and described, it is to be understood that a controller 90 is not necessary. The sensor 88 can operate as a switch that directly inactivates the pump 26 when the sensor 88 does not sense the sensing portion 86.

Complex systems that are used in the prior art to prevent movement of the locking ring 72 are not needed because the pump 26 shuts down when the locking ring 72 moves from the locked position. The operator can adjust the position of the locking ring 72 when the sensor 88 indicates that the locking ring 72 has moved, preventing leakage and increasing operator safety.

Although a beverage system 20 is illustrated and described, it is to be understood that the pump 26 of the present invention can be used in other systems. For example, the pump 26 can be used in a soft drink system. In this example, the pump 26 pumps flavored syrup which is mixed with carbonated water to make a soft drink. Alternately, the pump 26 pumps flavored syrup which is mixed with a frozen substance to create a frozen dessert.

The foregoing description is only exemplary of the principles of the invention. Many modifications and variations are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than using the example embodiments which have been specifically described. For that reason the following claims should be studied to determine the true scope and content of this invention. 

1. A pump comprising: a locking ring for retaining an adapter plate to a pump head, wherein the locking ring includes a sensing portion; and a sensor, wherein the sensor detects the sensing portion of the locking ring when the locking ring is in a locked position.
 2. The pump as recited in claim 1 further including a piston and a motor to move the piston, wherein the piston moves to draw a concentrate into a mixing chamber to combine with water to form a beverage.
 3. The pump as recited in claim 2 further including a pump head including a pump head piston opening that receives the piston and a water port that defines a water flow path, wherein the water flows along the water flow path and into the mixing chamber.
 4. The pump as recited in claim 3 wherein the adapter plate includes an adapter plate piston opening that receives the piston and a water opening that receives the water port, wherein the pump head piston opening of the pump head is substantially aligned with the adapter plate piston opening of the adapter plate.
 5. The pump as recited in claim 1 wherein the pump head includes a circumferential flange and the locking ring includes a first side having a first tab, an opposing second side having a second tab, and a gap therebetween, and the circumferential flange of the pump head is received in the gap.
 6. The pump as recited in claim 5 wherein the adapter plate includes a circumferential flange received in the gap of the locking ring.
 7. The pump as recited in claim 6 wherein the circumferential flange of the adapter plate includes a ramped portion having a lower part, an inclined part and a raised upper part, and the first tab on the first side of the locking ring engages the raised upper part of the adapter plate when the locking ring is in the locked position to secure the locking ring in the locked position.
 8. The pump as recited in claim 1 wherein the locking ring includes outward fingers extending from the locking ring.
 9. The pump as recited in claim 1 wherein the locking ring includes an outward projection including a recess, and the sensing portion is received in the recess of the outward projection.
 10. The pump as recited in claim 1 wherein the sensing portion is a magnet and the sensor is a reed switch.
 11. The pump as recited in claim 1 wherein the sensing portion is a ferrous object and the sensor is a capacitive switch.
 12. The pump as recited in claim 1 further including a controller that shuts down operation of the pump when the locking ring moves from the locked position and the sensor does not detect the sensing portion.
 13. A pump comprising: an adapter plate including a circumferential flange having a ramped portion with a lower part, an inclined part and a raised upper part; a pump head including a circumferential flange; a locking ring including a first side having a first tab, an opposing second side having a second tab, a gap therebetween and a sensing portion, wherein the circumferential flange of the pump head and the circumferential flange of the adapter plate are received in the gap of the locking ring, and the projection of the locking ring engages the raised upper part of the adapter plate when the locking ring is in a locked position; and a sensor that detects the sensing portion of the locking ring when the locking ring is in the locked position.
 14. The pump as recited in claim 13 further including a piston and a motor to move the piston, wherein the piston moves to draw a concentrate into a mixing chamber to combine with water to form a beverage.
 15. The pump as recited in claim 14 wherein the pump head includes a pump head piston opening that receives the piston and a water port that defines a water flow path, wherein the water flows along the water flow path and into the mixing chamber.
 16. The pump as recited in claim 15 wherein the adapter plate includes an adapter plate piston opening that receives the piston and a water opening that receives the water port, wherein the pump head piston opening of the pump head is substantially aligned with the adapter plate piston opening of the adapter plate.
 17. The pump as recited in claim 13 wherein the sensing portion is a magnet and the sensor is a reed switch.
 18. The pump as recited in claim 13 wherein the sensing portion is a ferrous object and the sensor is a capacitive switch.
 19. The pump as recited in claim 13 further including a controller that shuts down operation of the pump when the locking ring moves from the locked position and the sensor does not detect the sensing portion.
 20. A method of detecting a locking ring of a pump comprising the steps of: retaining an adapter plate to a pump head with the locking ring; sensing a sensing portion of the locking ring when the locking ring is in a locked position; and stopping operation of the pump when the sensor does not detect the sensing portion and the locking ring has moved from the locked position. 